private object GetDbQueryAggregationValue(DbQueryAggregateMode queryMode, Expression <Func <TModel, object> > columnSpecifier = null, Expression <Func <TModel, object> > specifierExpression = null, Expression <Func <TModel, object> > groupByExpression = null)
{
var queryStrategyProvider = _container.Resolve <IDbQueryStrategyProvider>();
var filterExpressions = new List <DbQueryWhereClause <TModel> >();
var groupByExpressions = new List <DbQueryGroupByClause <TModel> >();
if (specifierExpression != null)
{
filterExpressions.Add(new DbQueryWhereClause <TModel>()
{
Clause = specifierExpression,
Operator = DbQueryConditionOperators.And
});
}
if (groupByExpression != null)
{
groupByExpressions.Add(new DbQueryGroupByClause <TModel>()
{
Clause = groupByExpression
});
}
var strategy = queryStrategyProvider.GetSelectAggregationStrategy(
ModelStrategy,
queryMode,
filterExpressions,
new DbQueryColumnClause <TModel>()
{
ColumExpression = columnSpecifier
},
groupByExpressions);
var sql = strategy.GetDbQueryScript();
var dbparams = strategy.GetDbParameters().ToList();
_serviceProvider.Open();
object value;
try
{
value = _serviceProvider.QueryGetScalar(sql, dbparams);
}
catch (Exception exception)
{
throw new DbOperationException("ERROR_SQL_EXECUTION_FAILED", exception, sql, dbparams);
}
finally
{
_serviceProvider.Close();
}
return(value);
}
public object ExecuteScalar(string sql, object queryParams = null)
{
var autoClose = !(_provider.IsConnectionOpen());
if (autoClose)
{
_provider.Open();
}
var dbParams = GetQueryDataParameters(queryParams);
var scalar = _provider.QueryGetScalar(sql, dbParams);
if (autoClose)
{
_provider.Close();
}
return(scalar);
}
private object GetDbQueryAggregationValue(
DbQueryAggregateMode queryMode,
Expression <Func <TModel, object> > columnSpecifier,
Expression <Func <TModel, object> > conditionExpression = null)
{
if (queryMode != DbQueryAggregateMode.Any &&
queryMode != DbQueryAggregateMode.Count &&
queryMode != DbQueryAggregateMode.CountBig)
{
ParameterChecker.NotNull(columnSpecifier);
}
IDbQueryStrategy strategy;
var filterExpressions = new List <DbQueryWhereClause <TModel> >();
if (conditionExpression != null)
{
filterExpressions.Add(new DbQueryWhereClause <TModel>()
{
Clause = conditionExpression,
Operator = DbQueryConditionOperators.And
});
}
if (columnSpecifier == null)
{
strategy = _queryStrategyProvider.GetSelectAggregationStrategy(
_queryTable.ModelStrategy,
queryMode,
(filterExpressions.Any()) ? filterExpressions : _whereClauses
);
}
else
{
var columnExpression = new DbQueryColumnClause <TModel>()
{
ColumExpression = columnSpecifier
};
strategy = _queryStrategyProvider.GetSelectAggregationStrategy(
_queryTable.ModelStrategy,
queryMode,
(filterExpressions.Any()) ? filterExpressions : _whereClauses,
columnExpression
);
}
var sql = strategy.GetDbQueryScript();
var dbparams = strategy.GetDbParameters();
_serviceProvider.Open();
object value;
try
{
value = _serviceProvider.QueryGetScalar(sql, dbparams);
}
catch (Exception exception)
{
throw new DbOperationException("ERROR_SQL_EXECUTION_FAILED", exception, sql, dbparams);
}
finally
{
_serviceProvider.Close();
}
return(value);
}
